"Ruby Redneck Scuppers"...
This suggestion might sound a bit goofy to some, it is a utilitarian approach, (hey, it's for a Sport "Utilitarian" Vehicle, isn't it?) but I have done this on several ("old"er) vehicles in the past, it is a somewhat proactive approach to leaks or spills that does nothing to stop them, but makes their effects less severe and easier to clean up until they are fixed.
I take a sharp punch (a nail might work if the metal is thin enough) and punch a small hole at the lowest point in the spare tire well (you could do it in any of the body pans, like a floor well too). Check underneath before you do this, of course, we don't want holes in a brake line, fuel line, or gas tank, do we?
It will make a small hole that "volcanoes" downward and allow any water to drain, while stopping capillary rise from allowing any water (rain, splash spray) in. Better than drilling a hole - the piercing process also makes the hole a bit lower than the surrounding sheet metal.
A coating of thin grease on a coin-sized piece of rubber or plastic will make a barrier to incoming fumes if you are concerned about that later, and still allow water to run out on an occasion that it happens. A drop of oil rustproofs it for life.
Still worried about the hole but need to drain already-present water out? Then just plug the hole up with a short screw when you're done.
I am active in various watersports, and also carry distilled water jugs around occasionally, so this has been a bit of an insurance policy. Haven't done this to the Ex. Yet.